What are the common systems in plumbing?
The major categories of plumbing systems or subsystems are:
potable cold and hot tap water supply
plumbing drainage venting
sewage systems and septic systems with or without hot water heat recycling and graywater recovery and treatment systems
Rainwater, surface, and subsurface water drainage
fuel gas piping
hydronics, i.e. heating and cooling systems utilizing water to transport thermal energy, as in district heating systems, like for example the New York City steam system.
Choosing the right pipe for the created water supply and sewage
Installation of modern sanitary facilities, such as a bidet and a paddling pool, and even a shower, you may need to make some changes or additional connection in the home network plumbing. That is why plumbers are trying to choose such piping and branching to the network created by himself, to then easily it could be extended with new connections. As a result, the household will be able to connect new devices themselves, such as a washing machine or dishwasher, and only in the case of more complex devices ask for help from a plumber. By the way, he will be able to review the status of water supply, sewerage and clean it using modern methods and means.
Union - type of piping fitting
A union is similar to a coupling, except it is designed to allow quick and convenient disconnection of pipes for maintenance or fixture replacement. While a coupling would require either solvent welding, soldering or being able to rotate with all the pipes adjacent as with a threaded coupling, a union provides a simple transition, allowing easy connection or disconnection at any future time. A standard union pipe is made in three parts consisting of a nut, a female end, and a male end. When the female and male ends are joined, the nut then provides the necessary pressure to seal the joint. Since the mating ends of the union are interchangeable, changing of a valve or other device can be achieved with a minimum loss of time. Pipe unions are essentially a type of flange connector, as discussed further below.
In addition to standard, simple unions, other types of union exist:
Dielectric unions are unions with dielectric insulation, used to separate dissimilar metals (such as copper and galvanized steel) to avoid the damaging effects of galvanic corrosion. When two dissimilar metals are in contact with an electrically conductive solution (even tap water is conductive), they will form a battery and generate a voltage by electrolysis. When the two metals are in direct contact with each other, the electric current from one metal to the other will cause a movement of ions from one to the other, dissolving one metal and depositing it on the other. A dielectric union breaks the electric current path with a plastic liner between two halves of the union, thus limiting galvanic corrosion.
Rotary unions are unions that allow for rotation of one of the united parts.